indexing of discrepancy between matrices

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Dylan den Hartog 2021-7-12

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https://ww2.mathworks.cn/matlabcentral/answers/876763-indexing-of-discrepancy-between-matrices

评论： Matt J 2021-7-12

I want to find the discrepancy of scores.

Lets say there are three scores:

S1 = [0 1 0 2 4 3 1]

S2 = [1 1 0 4 4 3 0]

S3 = [0 2 0 4 4 1 1]

I want to find the indices of the columns where there are 1 or 2 zeros (the first and seventh column in the example). So the logical array should I want to get should be:

logical1 = [1 0 0 0 0 0 1]

idx1 = [1 7]

Also I want to find the indices of the columns where there is a difference of 2 or more between any two scores (the fourth and sixth column in the example). So the logical array should I want to get should be:

logical2 = [0 0 0 1 0 1 0]

idx2 = [4 6]

Can anyone help me out?

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Answer 1

Matt J 2021-7-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/876763-indexing-of-discrepancy-between-matrices#answer_744893

编辑：Matt J 2021-7-12

在 MATLAB Online 中打开

S1 = [0 1 0 2 4 3 1] ;
S2 = [1 1 0 4 4 3 0];
S3 = [0 2 0 4 4 1 1] ;
Q=sum(~[S1;S2;S3]);
logical2=Q==1 | Q==2
logical2 = 1×7 logical array
   1   0   0   0   0   0   1
Q=find(abs(S1-S2)>=2 | abs(S2-S3)>=2 | abs(S1-S3)>=2)
Q = 1×2
     4     6